Current overload protector structure

Abstract

A current overload protector structure comprises an overload protector and a thermal fuse; a heating wire, a movable reed, a movable contact and a static contact of the overload protector are connected in series with a circuit of electric equipment to form a loop; the movable contact is arranged on the movable reed; the static contact corresponds to the movable contact; double metal sheets are arranged between the movable reed and the heating wire; the thermal fuse is provided with a connecting end and a metal casing; the metal casing is one electrode of the thermal fuse, and the connecting end is the other electrode of the thermal fuse; the metal casing is clamped by a conductive clamping sheet; the clamping sheet, the thermal fuse and the loop are connected in series; and the fusing-off temperature of the thermal fuse is higher than the heated deformation temperature of the double metal sheets. The current overload protector structure can effectively avoid the condition that the double metal sheets of the overload protector generate metal fatigue, cannot bear heat and is deformed because the overload protector exceeds the life range, or can effectively avoid potential safety hazards caused by incapability of normal work of the overload protector in case of contact welding or adhesion caused by abnormal current.

Description

technical field [0001] The invention relates to a protection device for electrical equipment, in particular to a structure of a current overload protector. Background technique [0002] During the use of many electrical equipment, there will be excessive line current caused by excessive load, short circuit of the line, and aging of equipment insulation; if the equipment continues to be used when the line current is too large, it will cause it to heat up or even burn out. Long-term exposure to strong electricity will also reduce the insulation performance of the line or burn the line. [0003] Therefore, electrical equipment is generally connected in series with an overload protector. When an abnormal situation occurs during the operation of the electrical equipment and the current is too large, the excessive current will increase the temperature of the line, and the bimetal in the overload protector will be heated. And deformation, the action of deformation makes the bimeta...

AI Technical Summary

Problems solved by technology

[0004] However, in some equipment whose load changes frequently, such as ice machines, compressors, or electrical equipment whose actual current is unstable due to other reasons, there will often be operating currents exceeding the rated current of the equipment, in other words, overload The protector may trip frequently to cut off the current

The overload protector operates for a long time, and the elastic recovery of the bimetal sheet is limited. After exceeding the elastic recovery limit, it is likely to cause double-sheet bouncing fatigue; or the contact welding and adhesion caused by abnormal current cause the overload protector to fail. Normal work; these reasons lead to the failure of the bimetallic sheet to be heated and deformed normally, causing the failure of the overload protector

Once the overload protector fails, it is easy to burn the electrical equipment, posing a safety hazard

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